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Old 16th March 2006, 01:30 AM   #1
palmmed is offline palmmed  Ajman
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Join Date: Jun 2004
Location: chjm
Default audio switch automatic

Hello,

hope someone can help... I want something that can have 2 audio inputs, one from cell phone one from mp3 player, but will automatically switch from the primary(mp3) to the secondary (cell) input and then back again when the call is over (audio is ended). Thanks in advance.
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Old 17th March 2006, 06:44 PM   #2
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
Hi,
ESP has a circuit for auto switch on to control a power amp from audio signal exiting the pre.

You could use that to control a switch over relay to bring in the cell phone but without any of the delays.

Alternatively, there may be a DC signal out of the cell phone connector to alert connected equipment to reception of incoming radio signal. That DC could operate a transistor switch into relay.

All you have to do is identify the pin and determine if the DC signal goes low or goes high.
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Old 18th March 2006, 07:59 PM   #3
palmmed is offline palmmed  Ajman
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Join Date: Jun 2004
Location: chjm
Thanks for the heads up... do you have a link, and try to remember I know nothing of ciruitry. how hard would this be built for a novice? Thanks again
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Old 18th March 2006, 11:53 PM   #4
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
look up Elliot Sound Products (ESP) at
http://sound.westhost.com/projects.htm
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